BS ISO 7211-6-2020 Textiles一Methods for analysis of woven fa brics construction Part 6: Determination of the mass of warp and weft per unit area of fabric

BS ISO 7211-6-2020 Textiles一Methods for analysis of woven fa brics construction Part 6: Determination of the mass of warp and weft per unit area of fabric. This document specifies methods for determining the mass of the warp and weft threads per unit area of fabric after the removal of any non-fibrous matter. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 139. Textiles — Standard atmospheres for conditioning and testing ISO 1833-1. Textiles — Quantitative chemical analysis — Part 1: General principles of testing 3 Terms and definitions No terms and definitions are listed In this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at http://www.iso.org/obp — IEC Electropedia: available at http;JJwwwe1ectropedia.orgJ 4 Principle Method A: The outline of the fabric specimen to be dissected is marked in the form of a square or rectangle, and the nonfibrous matter is removed while the marked area still forms part of a larger sample and the threads cannot, therefore, be lost from it. lithe amount of non-fibrous matter is to be determined, it is stipulated that the larger sample shall be a square cut with its diagonals parallel to the directions of the threads in the fabric, lithe amount of non-fibrous matter has not to be determined, the larger sample may be of any shape or size. Method B: A specimen of known area is dissected and the non-fibrous matter is removed from the warp and welt threads. 5 Apparatus 5.1 Indelible marking Ink. 5.2 Scissors. Determine the mass of the marked area to an accuracy of 0,1 %. Working over paper of a colour suitable for showing up fragments of the yarn and fibre from the fabric being tested, fray out from one edge of the square or rectangle, and collect together the threads more easily removed from the fabric. From time to time, cut off the fringe of threads remaining in the other direction of the fabric and collect the short lengths together, keeping them separate from the more easily removed threads. When the whole of the marked area has been dissected into warp and...